SARA-R4/N4 series-AT Commands Manual
UBX-17003787 - R09
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22GNSS
Page 225 of 307
ephemeris was intended for. This makes downloading new ephemeris or aiding data for the first fix
unnecessary for subsequent start-ups of the receiver.
The AssistNow Autonomous feature may be not fully supported on all Multi-GNSS receivers. For more
details on AssistNow Autonomous feature see the corresponding u-blox-GNSS receiver description.
For a more detailed description on aiding modes and possible suggestions, see the GNSS Implementation
Application Note [52].
It is possible to combine different aiding modes: to enable them the sum of the <mode> value of the interested
aiding modes is needed (e.g.: aiding <mode>=3 means local aiding plus AssistNow Offline). Moreover it is also
possible to switch from one aiding mode to another one without powering off the GNSS receiver. If the following
sequence is provided (AT+UGPS=1,1 and then AT+UGPS=1,5) at the beginning the GNSS receiver will power on
with local aiding support and after the second command will be added the AssistNow Online. After the second
command the local aiding is not restarted, therefore the +UUGIND URC for it will not be sent again.
The latest u-blox GNSS products are multi-GNSS receivers capable of receiving and processing signals from
multiple Global Navigation Satellite Systems (GNSS). u-blox concurrent GNSS receivers are multi-GNSS
receivers that can acquire and track satellites from more than one GNSS system at the same time, and utilize
them for positioning. The <GNSS_systems> parameter configures the GNSS receiver into the required mode
of operation. It is possible to combine different GNSS systems. The combinations of systems, which can be
configured simultaneously depends on the receivers capability to receive several carrier frequencies. See the
corresponding GNSS receiver data sheet for the supported GNSS systems. If the Assisted GNSS unsolicited
indication is enabled, the +UUGIND URC will provide the current activated combinations of systems.
22.2.2î™–î™–î™–î™–Syntax
Type Syntax Response Example
Set
AT+UGPS=<mode>[,<aid_mode>[,
<GNSS_systems>]]
OK AT+UGPS=1,0,1
OK
Read
AT+UGPS?
+UGPS: <mode>[,<aid_mode>[,
<GNSS_systems>]]
OK
+UGPS: 1,0,1
OK
Test AT+UGPS=? +UGPS: (list of supported <mode>s),
(list of supported <aid_mode>),(list
of supported <GNSS_systems>)
OK
+UGPS: (0-1),(0-15),(1-127)
OK
22.2.3î™–î™–î™–î™–Defined values
Parameter Type Description
<mode> Number
• 0 (default value): GNSS receiver powered off
• 1: GNSS receiver powered on
<aid_mode> Number Supported aiding modes; the parameter is mandatory if <mode>=1; all these allowed
values can be combined together:
• 0 (default value): no aiding
• 1: automatic local aiding
• 2: AssistNow Offline
• 4: AssistNow Online
• 8: AssistNow Autonomous
<GNSS_systems> Number Bitmask for combining the supported GNSS types; the parameter is optional and the
allowed values can be combined together. The default value is 3 (GPS+SBAS):
• 1: GPS
• 2: SBAS
• 4: Galileo
• 8: BeiDou
• 16: IMES
• 32: QZSS
• 64: GLONASS
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